LM2901

Low-power quad voltage comparator

Datasheet - production data

• Input common-mode voltage range includes

negative rail
• Low output saturation voltage:
250 mV typ. (IO = 4 mA)
• Differential input voltage range equal to the
supply voltage
• TTL, DTL, ECL, MOS, CMOS compatible
62 outputs

Description
This device consists of four independent precision
voltage comparators, which are designed
specifically to operate from a single supply over a
76623 wide range of voltages. Operation from split
power supplies is also possible.
These comparators also have a unique
characteristic in that the input common-mode
voltage range includes the negative rail even
4)1[ though operated from a single power supply
ZHWWDEOHIODQN voltage.

Features
• Wide single supply voltage range or dual
supplies for all devices: +2 V to +36 V or ±1 V
to ±18 V
• Very low supply current (1.1 mA) independent
of supply voltage (1.4 mW/comparator at +5 V)
• Low input bias current: 25 nA typ.
• Low input offset current: ±5 nA typ.

December 2022 DocID2468 Rev 8 1/20

This is information on a product in full production. www.st.com
Contents LM2901

Contents

1 Pin connection and schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 4

3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4 Typical application schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

5 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.1 QFN16 3 x 3 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
5.2 QFN16 3 x 3 wettable flank package information . . . . . . . . . . . . . . . . . . . 14
5.3 SO-14 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.4 TSSOP14 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

6 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2/20 DocID2468 Rev 8

LM2901 Pin connection and schematic diagram

1 Pin connection and schematic diagram

Figure 1. Pin connections (top view)

Output 2 1 14 O u tput 3

Output 1 2 13 O u tput 4

VCC+ 3 12 VC C -

Inverting input 1 4 11 Non-inverting input 4

Non-inverting input 1 5 10 Inverting input 4

Inverting input 2 6 9 Non-inverting input 3

Non-inverting input 2 7 8 Inverting input 3

Figure 2. Schematic diagram

VCC

3.5 µ A 100 µA 3.5 µ A 100 µ A

Non-inverting
input
VO

Inverting
input

VCC

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Absolute maximum ratings and operating conditions LM2901

2 Absolute maximum ratings and operating conditions

Table 1. Absolute maximum ratings

Symbol Parameter Value Unit

VCC Supply voltage ±18 to 36 V

Vid Differential input voltage ±36 V
Vin Input voltage -0.3 to +36 V
(1)
Output short-circuit to ground

Thermal resistance junction to ambient (2)

DIP14 80
Rthja SO-14 105 °C/W
TSSOP14 100
QFN16 3x3 45

Thermal resistance junction to case (2)

DIP14 33
Rthjc SO-14 31
TSSOP14 32
QFN16 3x3 14
Tj Maximum junction temperature +150 °C
Tstg Storage temperature range -65 to +150 °C
HBM: human body model (3) 500 V
(4)
ESD MM: machine model 100 V
(5)
CDM: charged device model 1500 V
1. Short-circuits from the output to VCC+ can cause excessive heating and eventual destruction. The
maximum output current is approximately 20 mA, independent of the magnitude of VCC+.
2. Short-circuits can cause excessive heating. Destructive dissipation can result from simultaneous short-
circuits on all amplifiers. All values are typical.
3. Human body model: a 100 pF capacitor is charged to the specified voltage, then discharged through a
1.5 kΩ resistor between two pins of the device. This is done for all couples of connected pin combinations
while the other pins are floating.
4. Machine model: a 200 pF capacitor is charged to the specified voltage, then discharged directly between
two pins of the device with no external series resistor (internal resistor < 5 Ω). This is done for all couples of
connected pin combinations while the other pins are floating.
5. Charged device model: all pins and the package are charged together to the specified voltage and then
discharged directly to the ground through only one pin. This is done for all pins.

Table 2. Operating conditions

Symbol Parameter Value Unit

2 to 32
VCC Supply voltage V
±1 to ±16
Common mode input voltage range 0 to (VCC+ -1.5)
Vicm V
Tmin ≤ Tamb ≤ Tmax 0 to (VCC+ -2)
Toper Operating free-air temperature range -40 to +125 °C

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LM2901 Electrical characteristics

3 Electrical characteristics

Table 3. Electrical characteristics at VCC+ = 5 V, VCC- = GND, Tamb = 25° C

(unless otherwise specified)
Symbol Parameter Min. Typ. Max. Unit

Input offset voltage (1) 1 7

Vio mV
Tmin ≤ Tamb ≤ Tmax 15

Input offset current 5 50

Iio nA
Tmin ≤ Tamb ≤ Tmax 150
Input bias current (II+ or II-) (2) 25 250
Iib nA
Tmin ≤ Tamb ≤ Tmax 400
Large signal voltage gain
Avd 25 200 V/mV
(VCC = 15 V, RL = 15 kΩ, Vo = 1 to 11 V)
Supply current (all comparators)
ICC VCC = +5 V, no load 1.1 2 mA
VCC = +30 V, no load 1.3 2.5

Vid Differential input voltage (3) VCC+ V

Low level output voltage
VOL Vid = -1 V, Isink = 4 mA 250 400 mV
Tmin ≤ Tamb ≤ Tmax 700
High level output current
IOH (VCC = Vo = 30 V, Vid = 1 V 0.1 nA
Tmin ≤ Tamb ≤ Tmax 1 µA
Isink Output sink current (Vid = -1 V, Vo = 1.5 V) 6 16 µΑ
Small signal response time(4)
tres 1.3 µs
(RL = 5.1 kΩ connected to VCC+)
Large signal response time(5)
TTL input (Vref = +1.4 V, RL = 5.1 kΩ to
trel VCC+)
Output signal at 50% of final value 500 ns
Output signal at 95% of final value 1 µs
1. At output switch point, VO ≈ 1.4 V, RS = 0 with VCC+ from 5 V to 30 V, and over the full input common-mode
range (0 V to VCC+ –1.5 V).
2. The direction of the input current is out of the IC due to the PNP input stage. This current is essentially
constant, independent of the state of the output, so there is no loading charge on the reference of input
lines.
3. The response time specified is for a 100 mV input step with 5 mV overdrive.
4. Positive excursions of input voltage may exceed the power supply level. As long as the other voltage
remains within the common-mode range, the comparator will provide a proper output state. The low input
voltage state must not be less than –0.3 V (or 0.3 V below the negative power supply, if used).
5. Maximum values are guaranteed by design.

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Electrical characteristics LM2901

Figure 3. Supply current vs. supply voltage Figure 4. Input current vs. supply voltage

Figure 5. Output saturation voltage vs. output Figure 6. Response time for various input
current overdrives - negative transition

Figure 7. Response time for various input

overdrives - positive transition

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LM2901 Typical application schematics

4 Typical application schematics

Figure 8. Basic comparator Figure 9. Driving CMOS

5V
VCC = 5 V

15 kΩ 100 kΩ
+V(ref)
+V(ref)
1/ 4 &
1/4 LM2901
LM2901 VO
-V(ref)
-V(ref)

Figure 10. Driving TTL Figure 11. Low frequency op amp

5V
5V

15 kΩ

10 kΩ 1/4
LM2901
+V(ref) ~ el
1/ 4 & eo
LM2901
100 kΩ 0.5 µF
-V(ref)
& 1 kΩ
AV = 100

Figure 12. Low frequency op amp with boost Figure 13. Transducer amplifier
5V 5V

(eo = 0 V for el = 0 V)

15 kΩ Magnetic pick-up 10 kΩ 3 kΩ

1/ 4
LM2901 2N 2222 1/ 4
~ el LM2901 eo
0.5 µF

20 MΩ

100 kΩ
eo
1 kΩ 10 kΩ
AV = 100

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20
Typical application schematics LM2901

Figure 14. Low frequency op amp with Figure 15. Zero crossing detector (single power
offset adjust supply)
5V
5V

Offset adjust 100 kΩ

5V
100 kΩ 100 kΩ 5.1 kΩ
R2 1 MΩ 1 MΩ
5.1 kΩ 5.1 kΩ
RS R1
15 kΩ el

1/ 4 1/ 4
el ~ LM2901 2N 2222 LM2901
1N4148
0.5 µ F
R1
100 kΩ
1 kΩ 20 MΩ

eo 10 kΩ

Figure 16. Limit comparator Figure 17. Split-supply applications - zero

crossing detector
VCC (12 V) 15 V

2RS 10 kΩ
V(ref)
high 1/ 4 5.1 kΩ
LM2901
Lamp
RS
1/4
LM2901
eo
eI ~
eI ~
1/ 4
LM139 2N 2222
2RS
V(ref)
low 15 V

Figure 18. Crystal controlled oscillator Figure 19. Comparator with a negative
reference
VCC = 15 V 15 V

200 kΩ 2 kΩ
100 kΩ
5.1 kΩ
VCC

1/ 4
0
0.1 µF LM2901 eo
1/ 4
LM2901
eo
eI ~
f = 100 kHz
200 kΩ 5V
15 V

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LM2901 Typical application schematics

Figure 20. Time delay generator

VC C = +15 V

10 kΩ 15 kΩ 200 kΩ 3 kΩ

10 MΩ

10 kΩ

1/4 VCC
LM2901
V03
V3 to t3

3 kΩ
10 MΩ
10 kΩ 51 kΩ

VC1 10 kΩ
1/4
VCC LM2901
1/4
0
to tA LM2901 VO2 VCC
V2
V(ref.) to t2
Input gating signal 0.001 µF
3 kΩ
VCC
10 MΩ
51 kΩ
10 kΩ
1/4
V3 LM2901 V VCC
VC1 V2 O1
V1 t0 t1
V1
0 t
t 0 t1 t2 t3 t4 51 kΩ

Figure 21. Two-decade high-frequency VCO

VCC 100 kΩ VCC

100 kΩ
500 pF 3 kΩ 3 kΩ
1/ 4 5.1 kΩ
Frequency control
10 kΩ LM2901
voltage input 1/ 4
Vcontrol 0.01 µF LM2901 Output 1
0.1 µF

VCC /2
20 kΩ
Output 2
50 kΩ 20 kΩ

VCC /2
1/ 4
LM2901
VCC = + 30 V
+250 mV Vcontrol +50 V
700 Hz fo 100 kHz

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Package information LM2901

5 Package information

In order to meet environmental requirements, ST offers these devices in different grades of

ECOPACK packages, depending on their level of environmental compliance. ECOPACK
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK is an ST trademark.

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LM2901 Package information

5.1 QFN16 3 x 3 package information

Figure 22. QFN16 3 x 3 mm package mechanical drawing

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Package information LM2901

Table 4. QFN16 3 x 3 mm package mechanical data (pitch 0.5 mm)

Dimensions

Ref. Millimeters Inches

Min. Typ. Max. Min. Typ. Max.

A 0.80 0.90 1.00 0.031 0.035 0.039

A1 0 0.05 0 0.002
A3 0.20 0.008
b 0.18 0.30 0.007 0.012
D 2.90 3.00 3.10 0.114 0.118 0.122
D2 1.50 1.80 0.059 0.071
E 2.90 3.00 3.10 0.114 0.118 0.122
E2 1.50 1.80 0.059 0.071
e 0.50 0.020
L 0.30 0.50 0.012 0.020

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LM2901 Package information

Figure 23. QFN16 3 x 3 mm footprint recommendation

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Package information LM2901

5.2 QFN16 3 x 3 wettable flank package information

Figure 24. QFN16 3 x 3 mm wettable flank drawing outline

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LM2901 Package information

Table 5. QFN16 3x3 wettable flank mechanical data

Dimensions

Ref. Millimeters Inches

Min. Typ. Max. Min. Typ. Max.

A 0.90 0.95 1.00 0.035 0.037 0.039

A1 0 0.05 0 0.002
A2 0.75 0.030
A3 0.20 0.008
b 0.20 0.25 0.30 0.008 0.010 0.012
D 3.00 0.118
E 3.00 0.118
e 0.50 0.020
D2 1.56 1.66 1.76 0.061 0.065 0.069
E2 1.56 1.66 1.76 0.061 0.065 0.069
K 0.27 0.011
L 0.30 0.40 0.50 0.012 0.016 0.020

Figure 25. QFN16 3x3 wettable flank recommended footprint

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Package information LM2901

5.3 SO-14 package information

Figure 26. SO-14 package mechanical drawing

Table 6. SO-14 package mechanical data

Dimensions

Millimeters Inches
Ref.
Min. Typ. Max. Min. Typ. Max.

A 1.35 1.75 0.05 0.068

A1 0.10 0.25 0.004 0.009
A2 1.10 1.65 0.04 0.06
B 0.33 0.51 0.01 0.02
C 0.19 0.25 0.007 0.009
D 8.55 8.75 0.33 0.34
E 3.80 4.0 0.15 0.15
e 1.27 0.05
H 5.80 6.20 0.22 0.24
h 0.25 0.50 0.009 0.02
L 0.40 1.27 0.015 0.05
k 8° (max.)
ddd 0.10 0.004

16/20 DocID2468 Rev 8

LM2901 Package information

5.4 TSSOP14 package information

Figure 27. TSSOP14 package mechanical drawing

Table 7. TSSOP14 package mechanical data

Dimensions

Ref. Millimeters Inches

Min. Typ. Max. Min. Typ. Max.

A 1.20 0.047
A1 0.05 0.15 0.002 0.004 0.006
A2 0.80 1.00 1.05 0.031 0.039 0.041
b 0.19 0.30 0.007 0.012
c 0.09 0.20 0.004 0.0089
D 4.90 5.00 5.10 0.193 0.197 0.201
E 6.20 6.40 6.60 0.244 0.252 0.260
E1 4.30 4.40 4.50 0.169 0.173 0.176
e 0.65 0.0256
L 0.45 0.60 0.75 0.018 0.024 0.030
L1 1.00 0.039
k 0° 8° 0° 8°
aaa 0.10 0.004

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Ordering information LM2901

6 Ordering information

Table 8. Order codes

Temperature
Order code Package Packing Marking
range

LM2901D
SO-14 Tube or tape & reel
LM2901DT 2901
LM2901PT TSSOP14
LM2901Q4T QFN16 3 x 3 K5I

-40 °C to +125 °C QFN16 3 x 3

LM2901Q5T K552
wettable flank Tape & reel
SO-14
LM2901YDT (1)
(Automotive grade)
2901Y
TSSOP14
LM2901YPT (1)
(Automotive grade)
1. Qualified and characterized according to AEC Q100 and Q003 or equivalent, advanced screening according to AEC Q001
& Q 002 or equivalent.

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LM2901 Revision history

7 Revision history

Table 9. Document revision history

Date Revision Changes

01-Jan-2002 1 Initial release.

1 - PPAP references inserted in the datasheet see Table: Order
01-Jul-2005 2 codes on page 1.
2 - ESD protection inserted in Table 1 on page 3.
– The following changes were made in this revision:
01-Oct-2005 3 – – PPAP part number added in table Order codes on page 1.
– – Formatting changes throughout.
18-Jul-2006 4 ESD HBM value corrected in Table 1 on page 3.
Added Rthja and Rthjc parameters to Table 1: Absolute maximum
ratings. Added footnotes for ESD parameters.
19-Dec-2007 5 Removed Vicm parameter from electrical characteristics in Table 3.
Reformatted package information in Section 5.
Added footnotes for automotive grade parts in Table 8: Order codes.
Document reformatted.
30-Apr-2009 6 Updated package information in Chapter 5: Package information.
Removed note 2 under Table 8: Order codes.
Added QFN16 3 x 3 package in Chapter 5.
06-Feb-2012 7
Removed LM2901YD order code from Table 8.
Updated figure on the cover page.
12-Dec-2022 8 Removed DIP14 package.
Added new LM2901Q5T order code in Table 8 and new Section 5.2.

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 LM2901

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20/20 DocID2468 Rev 8